This might not affect the dell mini 9 since it uses an unpatched copy of mac os x. The changes are localized in the EFI (extensible firmware interface) I believe.
Still, I wouldn't risk losing time on possible issues.
Keep also in mind that you have to keep OSX updated to the latest version to work with the latest SDK releases. And some OSX updates update the EFI as well so there's the risk that you should have to wait for the patched EFI.
I wrote a very simple (but nice, in my obviously biased opinion) game which is on the App Store since november. It sold relatively well (at least in the first month) with zero marketing and without being featured.
Nonetheless, since then I've lost much of the initial motivation. So I know what you're talking about. Even though for me the reasons are more personal (and difficult to explain). I haven't had many problems with the whole publishing process though.
